Windows are a greatest source of energy loss causing a significant increase in energy bills. An average home approximately loses 30 percent of its heat or air conditioning energy through windows. In this age of energy crisis, this is an issue which needs to be addressed. We need to conserve energy and use the resources available carefully and responsibly starting in our homes. The growing research and development in ways to cut down on energy loss has led to the invention of modern energy efficient windows.
What is an energy efficient window?
An energy efficient window has following features-
* It saves energy and helps reduce the energy bills.
* It brings in more natural light while protecting the interiors from harmful sun rays.
* Prevents air infiltration and air leakage.
* Eliminates condensation.
* Makes your home energy efficient, healthy and comfortable.
How does it work?
Window performance is measured in U factor, SHGC( Solar Heat Gain Coefficient) and VT ( Visible Transmittance) of natural light. Energy is lost or gained by conduction, convection, radiation or air leakage. U factor accounts for the conductive and convective heat transfer from the warm side to the cold side of the window. This factor helps in determining the winter heating performance. Lower the U factor, better the insulation.
SHGC accounts for the radiant heat transfer from the sun through the window. Lower the SHGC, lesser the transfer of solar heat and better cooling performance for the window in summer.
While you want to capture the maximum heat and light in winter, you prefer more light with the heat kept out in summer. Modern windows help you do just that. The various components of the window mentioned below work together to achieve this.
Low E glass: This special glass comes with an invisible coating which lets in maximum light into the home but blocks the harmful ultraviolet rays which cause fading of your curtains, draperies and other furnishings. It also blocks out the excess heat of the sun. It helps to keep the home comfortable by keeping the heat in during winter and heat out during summer. This naturally reduces the energy used for heating or cooling. It also cuts down the energy consumed for lighting as your home has natural lighting through the day.
Double or triple pane: Usually windows have a single glass pane, which lets in the heat in and out easily. Energy efficient windows come with two or three glass panes, with the space between the panes filled with an inert gas like argon. The multiple panes and the gas together act as excellent insulators and prevent the transfer of heat. This also prevents condensation on the windows. . In addition to this, the modern windows use energy efficient spacers that are seals made usually of foam between the panes. These spacers increase the insulation by further regulating the amount of heat and cold that is able to pass through the window. The multiple panes, argon gas fill and the spacer together help in reducing the sound transmission too, making your home quieter.
Energy efficient materials: Energy efficient material like fiber glass, vinyl or wood is used for windows, which are natural thermal insulators. The frames can be further enhanced with foam to add more insulation.
So if you are going to replace windows, don't just look for style, look for energy efficiency too. Energy efficient windows can help you live comfortably, while you pay less for your electricity. If the question now is where to buy them, look for reputed companies which supply Energy Star rated and NFRC certified windows. Check out reviews of Champion Window a manufacturer and supplier of windows, and consider buying your energy efficient windows from them.
